EP 0632376 A2 19950104 - Encoding and rebuilding the data content of up to two unavailable DASDs in a DASD array.
Title (en)
Encoding and rebuilding the data content of up to two unavailable DASDs in a DASD array.
Title (de)
Kodierung und Rekonstruktion des Dateninhaltes von bis zu zwei nichtverfügbaren DASDs in einer DASD-Anordnung.
Title (fr)
Codage et reconstruction du contenu de données de pas plus que, deux DASDs non-disponibles dans un réseau de DASDs.
Publication
Application
Priority
US 8570793 A 19930630
Abstract (en)
The data contents of up to two concurrently failed or erased DASDs can be reconstituted where the data is distributed across M DASDs as an (M-1)*M block array and where (1) the (M-1)st DASD contains the simple parity taken over each of the array diagonals in diagonal major order in the same mode (odd/even) as that exhibited by the major diagonal of the array and (2) where the M-th DASD contains the simple even parity over each of the rows in row major order. Relatedly, short write updates require fewer operations for data blocks located off the major data array diagonal. <IMAGE> <IMAGE> <IMAGE>
IPC 1-7
IPC 8 full level
G06F 3/06 (2006.01); G06F 11/10 (2006.01); G06F 12/16 (2006.01); G11B 20/18 (2006.01); H03M 13/11 (2006.01)
CPC (source: EP)
G06F 11/1092 (2013.01); G11B 20/1833 (2013.01); H03M 13/11 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0632376 A2 19950104; EP 0632376 A3 19950301; EP 0632376 B1 19980211; DE 69408498 D1 19980319; JP 2750316 B2 19980513; JP H0728710 A 19950131
DOCDB simple family (application)
EP 94109687 A 19940623; DE 69408498 T 19940623; JP 14353594 A 19940624